Motor with fault-tolerant capability and low-loss flat wire winding structure

Abstract

The embodiment of the invention discloses a motor with a fault-tolerant capability and a low-loss flat wire winding structure, and relates to the technical field of aviation brushless direct current starting power generation and electric propulsion. The flat wires of the first channel and the second channel are alternately arranged in the groove, so that high-frequency alternating-current copper losses between the two channels are equal, and the situation that the overall output capacity is limited due to the fact that the temperature of a certain channel is too high is prevented. By limiting the flat wire at a position far away from the notch, the alternating current loss of the flat wire conductor is reduced. And meanwhile, cooling oil can be introduced into the reserved space in the groove, direct contact cooling of the conductor in the groove and the end part of the winding is realized, and the oil separation sleeve arranged at the inner circle of the motor stator can play a role in sealing the cooling oil in the groove, so that the cooling oil is prevented from entering a rotor air gap. Therefore, while suppression of turn-to-turn short-circuit current and fault-tolerant operation of other open-circuit faults are realized, the complexity of the winding structure is not increased as much as possible, and the operation reliability of the motor is guaranteed as much as possible.

Description

Technical Field

[0001] The present invention relates to the field of aviation brushless DC starting and generating technology and electric propulsion technology, and in particular to a motor with a low-loss flat wire winding structure and fault tolerance capability. Background Art

[0002] Aircraft starter generators integrate starting and generating functions, simplifying the aircraft power system architecture and helping to improve system power density. They are a key technology for power supplies in more-electric aircraft. Propulsion motors are the core electromechanical energy conversion components in electric propulsion systems and play a key role in providing propulsion power. For safety reasons, aircraft starter generators and electric propulsion motors are typically designed with single-turn winding structures to avoid serious fault conditions such as inter-turn short circuits. However, using a single-turn design leads to a number of other problems, including: 1) Single-turn winding designs are inflexible when adjusting winding parameters to accommodate different voltage levels, limiting design freedom; 2) The motor phase inductance is lower than that of multi-turn motors, resulting in higher current harmonics from controller switching devices and loads, leading to serious electromagnetic interference issues. 3) Due to the large current harmonics, single-turn motors generally require current filters, which increases system weight and volume and also affects system reliability.

[0003] To address these issues, one current research approach is to design aircraft starter generators and electric propulsion motors with multiple turns. However, the winding structure of a multi-turn architecture presents the possibility of inter-turn short-circuit failures, which in turn leads to reliability issues. Therefore, how to suppress inter-turn short-circuit currents and achieve fault-tolerant operation for other open-circuit faults while minimizing the complexity of the winding structure and thus maximizing motor reliability has become a research topic. Summary of the Invention

[0004] An embodiment of the present invention provides a motor with a fault-tolerant, low-loss flat wire winding structure, which can suppress inter-turn short-circuit current and achieve fault-tolerant operation of other open-circuit faults while minimizing the complexity of the winding structure and thereby maximizing the reliability of the motor operation.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] A motor with a low-loss flat wire winding structure having fault tolerance capability is provided. Slots are provided on the stator core (10) of the motor, including slots No. 1 to No. n. The inner wall of each slot is covered with slot insulation paper (8). Insulating end plates (7) are installed at both ends of the stator core (10) to support the slot insulation paper (8). Flat wires are wound in the slots through a first channel and a second channel. The flat wires of the first channel and the second channel are arranged in alternating layers in the slots, so that the high-frequency AC copper loss between the two channels is equal. By arranging the flat wires of the first channel and the second channel in alternating layers in the slots, the skin effect has the same effect on the two channels at high frequencies, thereby making the high-frequency AC copper loss between the two channels equal, solving the problem of uneven temperature distribution between the two channels and preventing the overall output capacity of a channel from being limited due to excessive temperature. The flat wires are wound at a position away from the slot opening. The winding adopts a dual-channel structure. After an open circuit fault occurs in a phase of one channel, the dual-channel motor can still achieve derating operation, thus achieving fault tolerance for the open circuit fault. A cooling oil channel (9) is provided in the stator core (10).

[0007] Among them, the flat wire in a channel in slot 1 is divided into the following categories according to the winding level: a1, and They represent the first layer flat wire (1) of the first slot of a channel, the third layer flat wire (3) of the first slot of a channel, and the fifth layer flat wire (5) of the first slot of a channel; the flat wires in the two channels in the first slot are divided into the following categories according to the winding levels: u k 、 and They respectively represent the second layer flat wire (2) of the second channel No. 1 slot, the fourth layer flat wire (4) of the second channel No. 1 slot, and the sixth layer flat wire (6) of the second channel No. 1 slot.

[0008] For a phase A series branch of a channel, the flat wire a1(1) located in the first layer of slot 1, the flat wire a2(13) located in the second layer of slot 1+y1, and the flat wire a3(18) located in the first layer of slot 1+2y1 are connected in series in sequence through their ends; y1 is the motor pitch (in this case, y1=9), and the winding adopts the wave winding form. a1, and The conductor in the A-phase series branch of a channel in slot 1, where one end of a1 is connected to the neutral point O1 of a channel, and the other end is connected to The winding ends are connected in series via n1=2p-1 identical flat wire conductors, where n1 represents n1 flat wire conductors and p represents the number of pole pairs. and The n1 conductors at the ends of the windings are connected in series. There is a Flat wire conductors are connected in series, where Z is the number of motor slots (Z = 72 in this case), p is the number of pole pairs (p = 4 in this case), m is the number of phases in each channel (m = 3 in this case), and N is the number of series turns per slot (N = 3 in this case).

[0009] For two channels, u k 、 and is the conductor in the U-phase series branch in slot 1, where u k There is a The flat wire conductors are connected in series, and the other end is connected to The n1 identical flat wire conductors at the winding ends are connected in series; and The n1 conductors at the ends of the windings are connected in series. The k-2n2-3 flat wire conductors between the neutral point O2 of the two channels are connected in series, where k is an integer.

[0010] Specifically, each slot is divided into 6 layers; Place it on the third layer in slot 1. Connect the flat wire located in the fourth layer of slot 1+y1 in sequence through the end and the flat wire located on the third layer of slot 1+2y1 Place it on the fifth layer in slot 1. Connect the flat wire located at the sixth layer of slot 1+y1 in sequence through the end and the flat wire located on the fifth layer of slot 1+2y1

[0011] u k , flat wire u located in the first layer of slot 1+y1 k-1 and the flat wire u located in the second layer of slot 1+2y1 k-2 , connected in series through their respective ends; Place it on the fourth floor in slot 1. Connect the flat wire located in the third layer of slot 1+y1 in sequence through the end and the flat wire located on the fourth layer of slot 1+2y1 Place it on the sixth layer in slot 1. Connect the flat wire located in the fifth layer of slot 1+y1 in sequence through the end and the flat wire located on the sixth layer of slot 1+2y1 By adopting the above winding arrangement, the upper and lower edges of all flat wire coils only span one layer of flat wire, and there is no situation where the upper and lower edges of the flat wire span multiple layers of flat wire. This can effectively reduce the end length and simplify the bending process of the end.

[0012] The flat wire placement method of this embodiment can achieve physical isolation of conductors connected in series in the same channel in the same slot by being separated by a flat wire in another channel, thereby converting the inter-turn short circuit between two contacting flat wires in the slot from the original inter-turn short circuit between the same series branches into an inter-turn short circuit between two channels; if a specified inter-turn short circuit occurs, the motor continues to operate with fault tolerance. The inter-turn short circuit situations in the slot can be divided into: short circuit situation 1 is when flat wire a1 and flat wire u k Between, short circuit situation 2 is flat wire u k With flat wire Between, short circuit situation 3 is flat wire With flat wire Between, short circuit situation 4 is flat wire With flat wire Between, short circuit situation 5 is flat wire With flat wire The short-circuit conditions in other slots are equivalent to the above five short-circuit conditions; the ratio of the effective value of the short-circuit phase current to the rated current in the above five short-circuit conditions, that is, the short-circuit current multiple, are 0.995, 1.02, 0.963, 0.947, and 0.968, respectively. It can be seen that this winding arrangement makes the change of the short-circuit current smaller with the change of the short-circuit position, which greatly simplifies the analysis of the inter-turn short-circuit condition. At the same time, the short-circuit current multiple is close to 1, the harm of the inter-turn short-circuit is small, and the fault-tolerant operation can continue under the condition of the inter-turn short-circuit.

[0013] Furthermore, insulating end plates (7) are installed at both ends of the stator core (10), and limiting teeth are provided on the insulating end plates (7), which are used to fix the slot insulating paper (8) and limit the flat wire conductor, thereby ensuring that the slot insulating paper and the flat wire are at a certain distance from the slot, so that the flat wire is away from the slot, thereby reducing the AC loss of the flat wire.

[0014] The oil-isolating sleeve (11) is installed on the inner circle of the stator core (10), and a cavity is formed by the stator core (10), the wound flat wire and the oil-isolating sleeve (11) as a cooling oil channel (9).

[0015] The embodiment of the present invention proposes a motor with a low-loss flat wire winding structure with fault tolerance. When the aviation starter generator and electric propulsion motor use multiple turns, direct contact of the flat wire conductors on the same series branch in the slot is avoided, so that the inter-turn short circuit between the two contacting flat wires in the slot is converted from the original inter-turn short circuit between the same series branch to an inter-turn short circuit between two channels, effectively suppressing the current amplitude when the multi-turn motor has an inter-turn short circuit fault, and achieving fault tolerance for short circuit faults; at the same time, due to the existence of multiple channels, fault-tolerant operation can still be achieved when a single-phase open circuit fault occurs. By arranging the flat wires of channel one and channel two in alternating layers in the slot, the high-frequency AC copper loss between the two channels is equal, preventing the overall output capacity of a channel from being limited due to excessive temperature. By limiting the flat wire to a position far away from the slot opening, the AC loss of the flat wire conductor is reduced. The remaining slot space allows for cooling oil to flow, enabling direct contact cooling between the conductors and the winding ends. An oil separator installed on the inner circumference of the motor stator seals the cooling oil in the slot, preventing it from entering the rotor air gap. This suppresses inter-turn short-circuit currents and allows for fault-tolerant operation in the event of other open-circuit faults, while minimizing the complexity of the winding structure and maximizing motor reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A cross-sectional view of slot 1 provided in an embodiment of the present invention;

[0018] Figure 2 Cross-sectional views of slot 1, slot 1+y1, and slot 1+2y1 provided in an embodiment of the present invention;

[0019] FIG3( a ) is a connection diagram of a one-channel A-phase and a two-channel U-phase flat wire winding according to an embodiment of the present invention;

[0020] FIG3( b ) is a connection diagram of a one-channel B-phase and a two-channel V-phase flat wire winding according to an embodiment of the present invention;

[0021] FIG3( c ) is a connection diagram of a one-channel C-phase and a two-channel W-phase flat wire winding according to an embodiment of the present invention;

[0022] Figure 4 A rectifier power generation circuit diagram of a two-channel motor flat wire conductor connection provided by an embodiment of the present invention;

[0023] Figures 5 to 9 Schematic diagram of five short-circuit conditions provided by an embodiment of the present invention;

[0024] Component symbol description in the figure: 1- flat wire a1; 2- flat wire u k ;3-Flat wire 4-Flat Wire 5-Flat Wire 6-Flat Wire 7-metal end plate; 8-slotted insulating paper; 9-cooling oil channel; 10-iron core; 11-oil separator; 12-flat wire u k-1 ; 13-flat wire a2; 14-flat wire 15-Flat Wire 16-Flat Wire 17 flat wire 18-flat wire a3; 19-flat wire u k-2 ;20-flat wire 21-Flat Wire 22-Flat Wire 23-Flat Wire 24-six-phase diode uncontrolled rectifier bridge; 25-filter capacitor. DETAILED DESCRIPTION

[0025] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention will be described in detail below, with examples of the embodiments illustrated in the accompanying drawings. Throughout, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended only to explain the present invention and are not to be construed as limiting the present invention. Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" as used in the description of the present invention refers to the presence of the stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or intervening elements may be present. Furthermore, "connected" or "coupled" as used herein may include wireless connections or couplings. The term "and / or" as used herein includes any and all combinations of one or more associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such herein.

[0026] Based on the above background, this case aims to propose a motor with a low-loss flat wire winding structure with fault tolerance. By arranging two channels of flat wire winding in the slot, and arranging the flat wire conductors of the two channels at intervals, direct contact of the flat wire conductors on the same series branch in the slot is avoided, so that the inter-turn short circuit between the two contacting flat wires in the slot is converted from the original inter-turn short circuit between the same series branch to an inter-turn short circuit between the two channels, effectively suppressing the current amplitude when the multi-turn motor has an inter-turn short circuit fault, and achieving fault tolerance for short circuit faults. At the same time, due to the existence of multiple channels, fault tolerance for single-phase open circuit faults can be achieved. By restricting the flat wire to a position far away from the slot opening, the AC loss of the flat wire conductor is reduced. At the same time, the space left in the slot can be filled with cooling oil to achieve direct contact cooling of the conductor in the slot and the winding end. The oil separator installed on the inner circle of the motor stator can seal the cooling oil in the slot and prevent the cooling oil from entering the rotor air gap.

[0027] The embodiment of the present invention provides a low-loss flat wire winding structure with fault tolerance capability, wherein the cross section of slot 1 and its surrounding components is as follows: Figure 1 、 Figure 2 、 Figure 3(a) to Figure 3(c) 、 Figure 4 As shown, the flat line a1(1), flat line u k (2) Flat wire Flat Wire Flat Wire Flat Wire The slots are composed of metal end plates (7), slot insulation paper (8), cooling oil channels (9), iron cores (10) and oil separators (11). The components contained in and around the remaining numbered slots are of the same type.

[0028] The low-loss flat wire winding structure with fault tolerance is characterized in that: the flat wire a1 (1) is Flat Wire The conductor in the A-phase series branch of a channel in slot 1, where one end of the flat wire a1(1) is connected to the neutral point O1 of a channel, and the other end is connected to the flat wire There are n1=2p-1 identical flat wire conductors connected in series through the winding ends. and flat wire There are also n1 conductors connected in series through the winding ends, and the flat wire There is a Flat wire conductors are connected in series, where Z is the number of motor slots (Z = 72 in this case), p is the number of pole pairs (4 in this case), m is the number of phases per channel (m = 3 in this case), and N is the number of series turns per slot (N = 3 in this case). For two channels, u k (2) Flat wire Flat Wire is the conductor in the U-phase series branch in slot 1, where the flat wire u k There is a The flat wire conductors are connected in series, and the other end is connected to the flat wire There are n1 identical flat wire conductors connected in series at the ends of the windings. and flat wire There are also n1 conductors connected in series through the winding ends, and the flat wire There are k-2n2-3 flat wire conductors connected in series between the neutral point O2 of the second channel.

[0029] The low-loss flat wire winding structure with fault tolerance includes a motor pitch of y1 (y1=9 in this case) and a wave winding. For a channel A phase series branch, the flat wire a1 (1) located in the first layer of slot 1, the flat wire a2 (13) located in the second layer of slot 1+y1, and the flat wire a3 (18) located in the first layer of slot 1+2y1 are connected in series in sequence through the ends; after being connected back to slot 1, the flat wire Place it on the third layer in slot 1 and connect the flat wire on the fourth layer in slot 1+y1 through the end. and the flat wire located on the third layer of slot 1+2y1 After the connection continues back to slot 1, place the flat wire Place it on the fifth layer in the slot and connect the flat wire on the sixth layer of slot 1+y1 through the end. (17) and the flat wire located in the fifth layer of slot 1+2y1 Connect in this way until the output end of phase A of channel 1. For the series branch of phase U of two channels, the flat wire u located in the second layer of slot 1 k (2) Flat wire u located in the first layer of slot 1+y1 k-1 (12) and the flat wire u located in the second layer of slot 1+2y1 k-2 (19), connect them in series through the ends; after connecting back to slot 1, Place it on the fourth layer in the slot and connect the flat wire on the third layer of slot 1+y1 through the end. and the flat wire located on the fourth layer of slot 1+2y1 After the connection continues back to slot 1, place the flat wire Place it on the sixth layer in the slot and connect the flat wire on the fifth layer of slot 1+y1 through the end. and the flat wire located on the sixth layer of slot 1+2y1 Continue this connection until you reach the neutral point of channel 2. Place the conductors for the remaining phases B and C of channel 1 and V and W of channel 2 in the same manner.

[0030] The low-loss flat wire winding structure with fault tolerance can achieve physical isolation by separating the conductors in series in the same slot and the same channel by a flat wire in another channel, thereby converting the turn-to-turn short circuit between the two contacting flat wires in the slot from the original turn-to-turn short circuit between the same series branches into a turn-to-turn short circuit between two channels. The turn-to-turn short circuit in the slot can be divided into the following categories: Figures 5 to 9 The five cases shown are: short circuit case 1 is the flat wire a1 and the flat wire u k Between, short circuit situation 2 is flat wire u k With flat wire Between, short circuit situation 3 is flat wire With flat wire Between, short circuit situation 4 is flat wire With flat wire Between, short circuit situation 5 is flat wire With flat wire The short-circuit conditions in other slots are equivalent to the above five short-circuit conditions; the ratios of the effective value of the short-circuit phase current to the rated current under the above five short-circuit conditions, that is, the short-circuit current multiples, are 0.995, 1.02, 0.963, 0.947, and 0.968, respectively. It can be seen that this winding arrangement makes the change of the short-circuit current smaller with the change of the short-circuit position, which greatly simplifies the analysis of the inter-turn short-circuit condition. At the same time, the current-to-current ratio is close to 1, the harm of the inter-turn short-circuit is small, and the fault-tolerant operation can continue under the condition of the inter-turn short-circuit.

[0031] The low-loss flat wire winding structure with fault tolerance adopts a dual-channel structure. After an open circuit fault occurs in a phase of one channel, the dual-channel motor can still operate at a reduced rating, thereby achieving fault tolerance for the open circuit fault.

[0032] The low-loss flat wire winding structure with fault tolerance is characterized by arranging the flat wires of the first and second channels in alternating layers within the slots, so that the skin effect at high frequencies has the same impact on the two channels, thereby making the high-frequency AC copper loss between the two channels equal, solving the uneven temperature distribution between the two channels and preventing the overall output capacity of a channel from being limited due to excessive temperature.

[0033] The low-loss flat wire winding structure with fault tolerance is characterized in that: by adopting the above-mentioned winding arrangement, the upper and lower edges of all flat wire coils only span one layer of flat wire, and there is no situation where the upper and lower edges of the flat wire span multiple layers of flat wire, which can effectively reduce the end length and simplify the bending process of the end.

[0034] The low-loss flat wire winding structure with fault tolerance is provided with metal end plates (7) installed at both ends of the stator core (10). The metal end plates (7) are provided with limiting teeth, which can fix the slot insulation paper (8) and limit the flat wire conductor, ensuring that the slot insulation paper and the flat wire are at a certain distance from the slot opening, so that the flat wire is away from the slot opening, thereby reducing the AC loss of the flat wire.

[0035] The low-loss flat wire winding structure with fault tolerance has a cooling system comprising an oil separator (11) installed on the inner circle of the motor stator, a retention cavity formed by the stator core (10), the flat wire and the oil separator (11), and a cooling oil channel (9) in the cavity.

[0036] In actual operation, the flat wires a1, a2, and a3 under the A-phase series branch of the first channel in slot 1, and the flat wire u under the U-phase series branch of the second channel are installed. k , flat wire and flat wire The neutral points of the two channels are isolated from each other; at the same time, the imbalance of the two channels is reduced by the cross-transposition of the flat wire in the slot; in order to support the slot insulation paper, an end plate with T-shaped teeth is added to the end face of the stator; and a cooling module, including an oil separator installed on the inner circle of the motor core, a retention cavity formed by the stator teeth, flat wire and oil separator, and a cooling oil channel in the cavity. The slot retention cavity keeps the flat wire away from the slot, which effectively reduces the AC loss of the flat wire at high frequency; the cooling oil channel in the slot retention cavity effectively cools the flat wire winding; the oil separator installed on the inner circle of the stator can effectively prevent the cooling oil from entering the rotor air gap. The flat wire winding structure of the present invention has fault tolerance for short circuit and open circuit faults, and can reduce the flat wire loss at high frequency.

[0037] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A motor with a fault-tolerant and low-loss flat wire winding structure, characterized in that: Slots are provided on the stator core (10) of the motor, including slots No. 1 to No. n, and slot insulation paper (8) is used to cover the inner wall of each slot. Insulating end plates (7) are installed at both ends of the stator core (10) to support the slot insulation paper (8); The flat wires are wound through the first and second channels in the slots. The flat wires of the first and second channels are arranged in alternating layers in the slots, so that the high-frequency AC copper loss between the two channels is equal. The flat wires are wound away from the slot openings. A cooling oil channel (9) is provided in the stator core (10).

2. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1, characterized in that: The flat wire in a channel in slot 1 is divided into the following categories according to the winding level: a1, and They respectively represent the first layer flat wire (1) of the first slot of a channel, the third layer flat wire (3) of the first slot of a channel, and the fifth layer flat wire (5) of the first slot of a channel; The flat wire in the second channel in slot 1 is divided into the following levels according to the winding level: u k 、 and They respectively represent a two-channel, No. 1 slot, two-layer flat wire (2), a four-channel, No. 1 slot, two-layer flat wire (4), and a six-channel, No. 1 slot, three-layer flat wire (6).

3. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1, characterized in that: a1. and The conductor in the A-phase series branch of a channel in slot 1, where one end of a1 is connected to the neutral point O1 of a channel, and the other end is connected to The winding ends are connected in series with n1=2p-1 identical flat wire conductors, where n1 and n2 represent the number of two different flat wire conductors and p represents the number of pole pairs. and The n1 conductors at the ends of the windings are connected in series. There is a Flat wire conductors are connected in series, where Z is the number of motor slots, m is the number of phases in each channel, and N is the number of series turns per slot.

4. The motor with a fault-tolerant low-loss flat wire winding structure according to claim 1 or 3, characterized in that: For two channels, u k 、 and is the conductor in the U-phase series branch in slot 1, where u k There is a The flat wire conductors are connected in series, and the other end is connected to The n1 identical flat wire conductors at the winding ends are connected in series; and The n1 conductors at the ends of the windings are connected in series. The k-2n2-3 flat wire conductors between the neutral point O2 of the two channels are connected in series, where k is an integer.

5. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1 or 3, characterized in that: Each slot is divided into 6 layers; Place it on the third layer in slot 1. Connect the flat wire located in the fourth layer of slot 1+y1 in sequence through the end and the flat wire located on the third layer of slot 1+2y1 Place it on the fifth layer in slot 1. Connect the flat wire located at the sixth layer of slot 1+y1 in sequence through the end and the flat wire located on the fifth layer of slot 1+2y1 6. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 5, characterized in that: u k , flat wire u located in the first layer of slot 1+y1 k-1 and the flat wire u located in the second layer of slot 1+2y1 k-2 , connected in series through their respective ends; Place it on the fourth floor in slot 1. Connect the flat wire located in the third layer of slot 1+y1 in sequence through the end and the flat wire located on the fourth layer of slot 1+2y1 Place it on the sixth layer in slot 1. Connect the flat wire located in the fifth layer of slot 1+y1 in sequence through the end and the flat wire located on the sixth layer of slot 1+2y1 7. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1, characterized in that: If a specified inter-turn short circuit occurs, the motor continues to operate with fault tolerance. The inter-turn short circuit conditions include: short circuit condition 1 is a1 and u k Short circuit between them; Short circuit situation 2 is u k and Short circuit between them; Short circuit situation 3 is and Short circuit between them; Short circuit situation 4 is and Short circuit between them; Short circuit situation 5 is and Short circuit between.

8. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1, characterized in that: Metal end plates (7) are installed at both ends of the stator core (10), and limiting teeth are provided on the insulating end plates (7) for fixing the slot insulating paper (8) and limiting the position of the flat wire conductor.

9. The motor with a fault-tolerant and low-loss flat wire winding structure according to claim 1, characterized in that: The oil-isolating sleeve (11) is installed on the inner circle of the stator core (10), and a cavity is formed by the stator core (10), the wound flat wire and the oil-isolating sleeve (11) as a cooling oil channel (9).

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